Entropy - learning decision trees, Computer Engineering

Assignment Help:

Entropy - learning decision trees:

Through putting together a decision of tree is all a matter of choosing that attribute to test at each node in the tree. Further we shall define a measure that is information gain that will be used to decide which attribute to test at each node. By considering through information gain is itself calculated utilising a measure called entropy that we first define for the case of a binary decision problem so then define for the general case. 

As per given a binary categorisation like C, and a set of examples, S, that are utilising the proportion of examples categorised as positive by C is p+  or the proportion of examples categorised  like negative by C is p-, then the entropy of S is as: 

641_Entropy - learning decision trees.png

Now next here instantly we defined entropy first for a binary decision problem is easier to get an impression of what it is trying to calculate. As Tom Mitchell puts this quite well: like 

"In order to define an information gain precisely so we begin by defining a measure commonly utilising in information theory that is called entropy in which characterizes the (im)purity of as an arbitrary collection of examples."


Related Discussions:- Entropy - learning decision trees

Instruction issue degree, Instruction Issue degree : The major concept in s...

Instruction Issue degree : The major concept in superscalar processing is how many instructions we can issue per cycle. If we issue k number of instructions per cycle in a supersca

Reference table and a reference field, A field containing currency amounts ...

A field containing currency amounts (data type CURR) must be assigned to a reference table and a reference field. Explain. As a reference table, a system having all the valid

Convert number to hexadecimal and decimal, Perform the following calculatio...

Perform the following calculations assuming that all numbers are stored in 16-bit registers as 2's complement binary numbers with no overflow provision. Convert each of the numbers

Explain two dimensional array, Explain two dimensional array In two dim...

Explain two dimensional array In two dimensional arrays, array is a pointer-to-pointer-to-data type.: at the first level, it points to a block of pointers, one for each row. Th

Advntages of parallel processing oversequential computation, Advntages of p...

Advntages of parallel processing oversequential computation Parallel computing has the following benefits over sequential computing: i)    Accumulate time ii)   Solves b

Explain deadlock, What is a deadlock? A deadlock is a situation that ca...

What is a deadlock? A deadlock is a situation that can increase when two units, A and B use a shared resource. Assume that unit B cannot complete its task unless unit A complet

Program in java, Write a program to display grade message according to the ...

Write a program to display grade message according to the marks

Row-major order and column-major order of arrays, Two-dimensional array is ...

Two-dimensional array is represented in memory in following two ways: 1.  Row major representation: To attain this linear representation, the first row of the array is kept in

Discussion., Functionality first and then Security?

Functionality first and then Security?

What do you mean by best fit, What do you mean by best fit?  Best fit a...

What do you mean by best fit?  Best fit allocates the smallest hole that is big enough. The whole list has to be searched, unless it is sorted by size. This method makes the sm

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd